This paper reports the crack growth behavior of pipeline steels in near-neutral pH environments. Crack growth data both from laboratory tests using compact tension (CT) specimen and from full scale tests of shallow cracks were analyzed using a true corrosion-fatigue model established recently. It has been found that the crack growth rate can be correlated with ΔK2Kmax/fα, where ΔK is the stress intensity factor range; Kmax is the maximum stress intensity factor; f is the loading frequency; and α is a factor related to corrosivity of soil environments. This correlation enables determination of threshold ΔK2Kmax/fα values for long cracks such as in a test using CT specimen. The above growth correlation appears also true for small/shallow cracks in full scale tests except that small/shallow cracks were found to grow at appreciable rates below the threshold of long/deep cracks. Implications of the growth model to crack growth occurring in the field and pipe integrity management were also discussed in the paper.
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2008 7th International Pipeline Conference
September 29–October 3, 2008
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute and the Pipeline Division
ISBN:
978-0-7918-4858-6
PROCEEDINGS PAPER
Crack Growth Model of Pipeline Steels in Near-Neutral pH Soil Environments
Weixing Chen,
Weixing Chen
University of Alberta, Edmonton, Alberta, Canada
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R. Kania,
R. Kania
TransCanada PipeLines Limited, Calgary, Alberta, Canada
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R. Worthingham,
R. Worthingham
TransCanada PipeLines Limited, Calgary, Alberta, Canada
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S. Kariyawasam
S. Kariyawasam
TransCanada PipeLines Limited, Calgary, Alberta, Canada
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Weixing Chen
University of Alberta, Edmonton, Alberta, Canada
R. Kania
TransCanada PipeLines Limited, Calgary, Alberta, Canada
R. Worthingham
TransCanada PipeLines Limited, Calgary, Alberta, Canada
S. Kariyawasam
TransCanada PipeLines Limited, Calgary, Alberta, Canada
Paper No:
IPC2008-64475, pp. 713-722; 10 pages
Published Online:
June 29, 2009
Citation
Chen, W, Kania, R, Worthingham, R, & Kariyawasam, S. "Crack Growth Model of Pipeline Steels in Near-Neutral pH Soil Environments." Proceedings of the 2008 7th International Pipeline Conference. 2008 7th International Pipeline Conference, Volume 2. Calgary, Alberta, Canada. September 29–October 3, 2008. pp. 713-722. ASME. https://doi.org/10.1115/IPC2008-64475
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